function validateNull(){
			//alert(document.getElementById("maintainreportinsert_maintainreporter").value)
			if(document.getElementById("maintainreportinsert_maintainreporter").value == "")
			{
				alert("报修人不能为空");
				return false;
			}
			if (document.getElementById("maintainreportinsert_maintainreportplace").value == "")
			{
				alert("报修地点不能为空");
				return false;
			
			}
			 if (document.getElementById("maintainreportinsert_maintainreportcontent").value == "")
			{
				alert("报修内容不能为空");
				return false;
			
			}
			 if (document.getElementById("maintainreportinsert_maintainreportavailtimespec").value == "")
			{
				alert("维修预约时间不能为空");
				return false;
			
			}
			 if (document.maintainreport.maintainreporttype.options[document.maintainreport.maintainreporttype.selectedIndex].value  == "其他")
			{
				if (document.getElementById("maintainreportinsert_maintainreporttype_other").value == "")
				{
					alert("请输入维修类型");
					return false;
				}
			
			}
			
			
			else return true;
}